US2685570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for precipitating synthetic polyamides in combination with silk fiber
Assignee: Individual
•
Filing: 1952-02-28
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Granted: 1954-08-03
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Expires: 1972-02-28
Abstract
No abstract record available.
Inventors
- 👤 Verdiers Edward Erlick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:19
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/64; A61K8/72; A61K8/84; A61K8/88; C; C09; C09D; C09D177/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS OF REDUCING POLYAMIDES AND THEIR DERIVATIVES SELECTED FROM THE GROUP COMPRISING POLYHEXAMETHYLENE ADIPAMIDE, POLYDECAMETHYLENE SEBACAMIDE, CAPROLACTAM AND INTERPOLYAMIDES OF AMINO-CAPROIC ACID WITH CAPROLACTAM INTO FINELY DIVIDED PARTICLES HAVING DISTINCTIVE ADSORBENCY THAT COMPRISES COMBINING (A) SAID POLYAMIDES IN AN AQUEOUS STRONG INORGANIC ACID SOLUTION, (B) AN OXIDIZING ALKALINE SOLUTION, AND (C) SILK FIBER MATERIAL DISSOLVED IN ONE OF SAID SOLUTIONS THEREBY PRECIPITATING THE DISSOLVED MATERIALS FROM SAID COMBINED SOLUTION, SAID PRECIPITATED MATERIALS BEING AS FRIABLE AGGLOMERATION OF COLLODIAL PARTICLES HAVING AN ADSORBENT SILK FIBROIN MEMBRANE OR COATING ATTACHED TO THE POLYAMIDE NUCLEUS, REMOVING THE SOLVENT, WASHING THE PRECIPITATED PRODUCT, DRYING THE WASH PRODUCT AND COMMINUTING IT INTO A FINE POWDER.
Claim 2
Dependent Claim
111 words
A PROCESS OF REDUCING POLYAMIDES AND THEIR DERIVATIVES SELECTED FROM THE GROUP COMPRISING POLYHEXAMETHYLENE ADIPAMIDE, POLYDECAMETHYLENE SEBACAMIDE, CAPROLACTAM AND INTERPOLYAMIDES OF AMINO-CAPROIC ACID WITH CAPROLACTAM INTO FINELY DIVIDED PARTICLES HAVING DISTINCTIVE ADSORBENCY THAT COMPRISES COMBINING (A) SAID POLYAMIDES IN AN AQUEOUS STRONG INORGANIC ACID SOLUTION, (B) AN OXIDIZING ALKALINE SOLUTION, AND (C) SILK FIBER MATERIAL DISSOLVED IN ONE OF SAID SOLUTIONS THEREBY PRECIPITATING THE DISSOLVED MATERIALS FROM SAID COMBINED SOLUTION, SAID PRECIPITATED MATERIALS BEING AS FRIABLE AGGLOMERATION OF COLLODIAL PARTICLES HAVING AN ADSORBENT SILK FIBROIN MEMBRANE OR COATING ATTACHED TO THE POLYAMIDE NUCLEUS, REMOVING THE SOLVENT, WASHING THE PRECIPITATED PRODUCT, DRYING THE WASH PRODUCT AND COMMINUTING IT INTO A FINE POWDER.
References Cited (Backward Citations)
US2289775A
Cited
GB626380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |